Dorcy 6-Volt/4D-4.8-Volt, 0.75A Miniature Flange Base Krypton Replacement Bulb, 2-Pack (41-1663) 4.8 volts, 0.75 amps. 2 per package. Krypton KPR 113. Designed to work with 6 volt and 4 D lights.